Finding the Third Proportional to 8,320.78 and 18,099.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,320.78 : 18,099.56 = 18,099.56 : x
2. Step 2: Convert to fraction form
   8,320.78/18,099.56 = 18,099.56/x
3. Step 3: Cross multiply
   8,320.78x = 18,099.56 × 18,099.56
4. Step 4: Simplify right side
   8,320.78x = 327,594,162.69
5. Step 5: Solve for x
   x = 327,594,162.69/8,320.78
6. Step 6: Final answer
   x = 39,370.60